Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1990-04-16
1991-10-08
Wallace, Linda J.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
250233, 250237R, 7386105, 7386106, 364713, 364822, 364827, G01P 336, G06E 104, G06G 719
Patent
active
050549138
ABSTRACT:
A method and apparatus for measuring the velocity of a fluid in which a double-exposure image of the speckle pattern or particle images of tracer particle in a fluid is irradiated with a collimated beam of coherent light, and is subjected to Fourier transformation to produce Young's fringes at its focal plane. A slit is rotated relatively with respect to the double-exposure image to produce changes in the amount of light transmitted by the slit and determine the direction of the fringes. To determine the spacing of the fringes, a variable-spacing grating filter is used which is complementary to the image of the fringes and has a transmission distribution function of sin.sup.2 or cos.sup.2. The thus obtained direction and spacing of the fringes are used to determine the velocity of the fluid.
REFERENCES:
patent: 4866639 (1989-09-01), Adrian
patent: 4925296 (1990-05-01), Reichmuth
Taniji et al., Spatial Modulating Analysis of the Young's Fringes by a Rotary Slit and a Liquid Crystal Television, (ICO-15, West Germany), SPIE, vol. 1319 (1990.8), p. 262.
Ishikawa Muneharu
Taniji Ayafumi
Adams Bruce L.
Kowa Company Ltd.
Wallace Linda J.
Wilks Van C.
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